XMMEPICSOC

Richard SaxtonBackground, Operations & Calibration (BOC) meeting

Mallorca, 30/03/09-01/04/09

The Timing Mode PSF

Richard Saxton, Maria Diaz Trigo, Matteo Guainazzi

XMMEPICSOC

Richard SaxtonBackground, Operations & Calibration (BOC) meeting

Mallorca, 30/03/09-01/04/09

Columns in Timing mode

XMMEPICSOC

Richard SaxtonBackground, Operations & Calibration (BOC) meeting

Mallorca, 30/03/09-01/04/09

Current SAS: Flux per column

Col Constant

0 1.01 1.23 2 1.653 2.154 2.535 3.146 3.787 4.69

Fit to Vela with: Const * wabs * plaw

XMMEPICSOC

Richard SaxtonBackground, Operations & Calibration (BOC) meeting

Mallorca, 30/03/09-01/04/09

SAS 8 arfgen - GX 339+4 (1000 c/s)

All columnsAll – col 0All – col-1 to col+1All – col-2 to col+2All – col-3 to col+3All – col-4 to col+4

XMMEPICSOC

Richard SaxtonBackground, Operations & Calibration (BOC) meeting

Mallorca, 30/03/09-01/04/09

SAS 8 arfgen - 1254 (600 c/s)

1254

XMMEPICSOC

Richard SaxtonBackground, Operations & Calibration (BOC) meeting

Mallorca, 30/03/09-01/04/09

SAS 8: Add up annular contriutions

XMMEPICSOC

Richard SaxtonBackground, Operations & Calibration (BOC) meeting

Mallorca, 30/03/09-01/04/09

New arfgen method: Integrate the PSF image

XMMEPICSOC

Richard SaxtonBackground, Operations & Calibration (BOC) meeting

Mallorca, 30/03/09-01/04/09

Integrated PSF image technique

XMMEPICSOC

Richard SaxtonBackground, Operations & Calibration (BOC) meeting

Mallorca, 30/03/09-01/04/09

Integrated PSF image technique

Flux in inner 9 cols / flux in cols -4 to -2 and +2 to +4

-10%

+10%

XMMEPICSOC

Richard SaxtonBackground, Operations & Calibration (BOC) meeting

Mallorca, 30/03/09-01/04/09

Practical spectral fitting effects

Spectrum

NH=2.3E+22Gauss = 6.44 keV 1.04 keV 0.02Disk_T = 2.26Bbod_T = 1.06

Tbabs (gauss*diskbb*bbod)

XMMEPICSOC

Richard SaxtonBackground, Operations & Calibration (BOC) meeting

Mallorca, 30/03/09-01/04/09

Practical spectral fitting effects Original Spectrum

NH=2.3E+22Gauss = 6.44 keV 1.04 keVDisk_T = 2.26Bbod_T = 1.06

* Linear ramp

NH=2.32E+22Gauss = 6.42±0.04 1.06±0.04Disk_T = 2.40±0.09

* Ramp with extra at 6keV

NH=2.34E+22Gauss = 6.55±0.03 0.99±0.04Disk_T = 2.34±0.09

IgnoreInner 3 cols

IgnoreInner 5 cols

+15%

-10%

+10%

-10%

XMMEPICSOC

Richard SaxtonBackground, Operations & Calibration (BOC) meeting

Mallorca, 30/03/09-01/04/09

MKN 421 simple power-law test

Excluding inner 3 columnsgives a 15% decrease in measuredflux. Slope is stable.

XMMEPICSOC

Richard SaxtonBackground, Operations & Calibration (BOC) meeting

Mallorca, 30/03/09-01/04/09

Conclusions

Major problem with ARF in SAS 8 when inner columns are excluded in timing mode observations. New image integration technique fixes this Residual problem at 15% level in flux if inner 3 cols excluded Spectral parameters reasonably consistent so looking acceptable…